Two days after the City Council suspended a procedural rule to expedite passage of a synthetic marijuana ordinance, Mayor Thomas Hoye Jr. has signed it into law.

On Thursday, Hoye held a brief press conference in the council chambers to mark the event. He was accompanied by Taunton City Solicitor Jason Buffington, assistant solicitor Daniel de Abreu and Police Chief Edward Walsh.

Walsh and de Abreu collaborated on writing what is now known as Chapter 14 of Section 14-24: Synthetic Drugs.

Anyone caught selling, possessing or using synthetic marijuana or marijuana analogue will be fined $150 and $350 for each subsequent offense.

Walsh said warning letters will be hand-delivered to 85 local businesses licensed to sell tobacco, including convenience stores, gas stations and supermarkets.

Ingredients listed in the ordinance are often found in products labeled as bath salts, spice and potpourri. Walsh said the most common method of ingestion in Taunton is smoking.

Bath salts and synthetic marijuana have been tied to a growing number of incidents involving erratic and sometimes psychotic behavior. Walsh said his department has had to deal with a growing number of people suffering adverse reactions, which in some cases can result in death.

Convenience store owners and online sellers have circumvented laws banning bath salts and synthetic pot by claiming their product is not being intended for human consumption. Manufacturers, meanwhile, have substituted one chemical for another to stay ahead of law enforcement.

Since August 2012, bath salts have been illegal in Massachusetts and classified as a Class C substance.

“Enough is enough,” Hoye said, adding that synthetic drugs being sold in stores provide “another avenue for kids to get high.”

Hoye complimented Walsh, the city’s law department and the City Council for their “swift action” in drafting and approving the ordinance.

De Abreau said he consulted and collaborated with Walsh over a period of “several months.”

“It provides another important law enforcement tool,” de Abreu said.

Walsh said details of the ordinance will be posted on his department’s Facebook page. He also said any business caught stocking and selling the contraband will be subject to a suspension by the license commission of the ability to sell tobacco, food and beverages.

Walsh wouldn’t say if police planned to conduct undercover or sting operations to ensure store owners comply with the ordinance. But he implied that police would be keeping an eye out.